PIONEER SX-424-KUW (01) PDF MANUAL

The MODEL SX-424 comes in two versions distinguished as follows:

• 50W (4Ω)

• 37W (8Ω)

• 18W/18W (4Ω)

• 14W/14W (8Ω)

• 13W + 13W (4Ω)

• 12W + 12W (8Ω)

Less than 1% (Continuous power output).

Less than 1% (Continuous power output).

20Hz to 45kHz (8Ω, Harmonic distortion less than 1%).

20Hz to 70kHz, ±3dB.

4 to 16Ω.

40 (8Ω, 1kHz).

• PHONO MAG: 3mV/50kΩ

• MIC: 4.5mV/50kΩ

• AUX: 180mV/100kΩ

• TAPE MONITOR: 180mV/100kΩ

• TAPE MONITOR (DIN): 180mV/100kΩ

• TAPE REC (Pin Jack): 180mV

• TAPE REC (DIN connector): 36mV

-9dB, +9dB/100Hz.

-9dB, +6dB/10kHz.

PHONO: RIAA S.T.D.

+9.5dB/100Hz, +5.5dB/10kHz with Volume Control set at -40dB position.

• PHONO: More than 75dB

• AUX: More than 85dB

• 88MHz to 108MHz

• 87.5MHz to 108MHz (FTZ approved)

2.3µV.

3.5dB.

More than 50dB (98MHz).

More than 80dB (90MHz).

More than 70dB (98MHz).

45dB.

65dB.

• Mono: less than 0.6% (100% Mod.)

• Stereo: less than 0.8% (100% Mod.)

Signal strength type.

More than 40dB (1kHz).

More than 35dB.

Switchable to ON-OFF.

Impedance 300Ω balanced and 75Ω unbalanced.

525kHz to 1,605kHz.

15µV.

More than 45dB (1,000kHz).

More than 35dB.

More than 50dB.

Built-in ferrite loopstick antenna.

The power requirements are:

• 120V 60Hz

• 220V 50-60Hz

• or 110V, 120V, 130V, 220V and 240V. (Switchable) 50-60Hz.

90W (Max.).

Switched 1, Unswitched 1.

• Width: 16-31/32 in. / 431 mm

• Height: 5-3/4 in. / 146 mm

• Depth: 13-21/32 in. / 347 mm

• 16 lb, 8oz / 7.5 kg (120 voltage model)

• 17 lb, 6oz / 7.9 kg

• 20 lb, 14oz / 9.5 kg (120 voltage model)

• 21 lb, 13oz / 9.9 kg

The furnished parts include:

• FM T-type Antenna (1)

• Fuse: 1A (1), 0.5A (5 line voltage model only) (2)

• Pin Plug (2)

• Speaker Plug (4)

• Polishing Cloth (1)

• Operating Instructions (1)

NOTE: Specification and the design subject to possible modification without notice due to improvements.

The SPEAKERS SWITCH is a combination of the power on/off switch and the speaker system selector switch with the following positions:

• POWER OFF: The equipment is dead.

• A: Sound comes through the speaker system A.

• SPKR OFF: No sound from any speaker system. Useful for listening through headphones.

• B: Speaker system B is in operation.

• A+B: Both speaker systems A and B are in operation.

The PHONES JACK is for plugging in stereo headphones. A variety of high-performance headphones is available from Pioneer.

The BASS & TREBLE CONTROLS control bass and treble. Turning each control clockwise from the FLAT position will boost the tone, and turning it counterclockwise will diminish the tone.

The volume increases when this dual-concentric control is turned clockwise and decreases when the control is turned counterclockwise. Both parts of the knob usually rotate together. To adjust the volume of either the right or left channel alone, hold one part of the control knob with one hand and turn the other with the other hand. This is convenient for balancing the volume of both channels. The front knob is for the left channel, the rear one for the right.

The SIGNAL METER indicates the signal strength of the received AM or FM station.

The STEREO INDICATOR lights when an FM broadcast is in stereo.

The TUNING KNOB is used to select desired stations.

The MIC JACK accepts the plug of a microphone. When a microphone is plugged into this jack, the signal from the turntable is interrupted, i.e., record playing becomes impossible.

The SELECTOR SWITCH chooses the program source:

• AM: AM reception.

• FM MONO: FM monophonic reception only.

• FM AUTO: FM reception with automatic switching for either stereo or monophonic programs.

• PHONO/MIC: For playing records or using a microphone.

• AUX: Program source plugged into the AUX jacks.

The MODE SWITCH has two settings:

• STEREO: Stereo sound, left and right channels separated.

• MONO: Left and right channels blended. Monophonic sound.

The TAPE MONITOR SWITCH is set to ON (pushed) for monitoring a recording in progress and for playback of recorded tapes, when the tape deck is connected to the TAPE MON jacks and TAPE REC jacks or TAPE REC/P.B. socket.

When listening at a low volume level, set this switch to ON (pushed). This emphasizes the extreme high and low ends of the sound spectrum, giving a more natural sound contour.

NOTE: If the front panel inscriptions of your unit become dirty, clean them with volatile fluid (chemical thinner, pure alcohol, etc.). In this case, the letters on the front panel may be blotted. Wipe out them with a soft dry cloth, however they will still remain unerased.

Connect the FM outdoor antenna to the FM ANT terminals. For a 300Ω feeder, use the 300Ω BAL terminals. For 75Ω coaxial cable, use the 75Ω UNBAL terminal and the GND terminal.

Connect an AM antenna to the AM ANT terminal and the GND terminal. The receiver also has a built-in AM FERRITE ANTENNA.

Connect the turntable’s output cables to the PHONO MAG (LEFT and RIGHT) input jacks on the receiver. Connect the turntable’s ground wire to the GND terminal on the receiver.

Connect the tape player’s output cables to the AUX (LEFT and RIGHT) input jacks on the receiver.

• For playback: Connect the tape deck’s LINE OUTPUT to the TAPE MON/4CH IN (LEFT and RIGHT) jacks on the receiver.

• For recording: Connect the TAPE REC/4CH OUT (LEFT and RIGHT) jacks on the receiver to the tape deck’s LINE INPUT.

Connect speaker system A to the SPEAKERS A (LEFT and RIGHT) terminals. Connect speaker system B to the SPEAKERS B (LEFT and RIGHT) terminals. Ensure speakers are within the 4Ω to 16Ω range.

The receiver provides AC OUTLETS:

• SWITCHED: 200 VA MAX. These outlets are powered on/off with the receiver.

• UNSWITCHED: 300 VA MAX. These outlets are always powered if the receiver is plugged in.

• For the 120V Model: 1A

• For the 5-voltage Model:

• 110V, 120V, 130V: 1A

• 220V, 240V: 0.5A

The numbers indicate order of disassembly.

1. Remove 4 screws from both sides of wooden case.

2. Pull off all knobs, then remove nuts and washers from shafts of SPEAKERS, TREBLE, and SELECTOR.

3. Remove 2 screws from top of front panel.

4. Remove 8 screws from bottom plate of receiver.

1. Set the tuning capacitor to maximum capacitance.

2. Tie one end of the string to the spring on the tuning pulley.

3. Pull the string around the small pulley A.

4. Lead the string around the small pulleys B and C, then wind it 3 turns around the tuning shaft.

5. Wind the string 2 turns around the tuning pulley.

6. Finally, tie the end of the string to remaining side of spring on the tuning pulley.

7. Tune receiver to low end. Fasten dial pointer to string so that indicates low end on dial scale.

The required instruments for alignment are:

• FM/AM Signal generator

• FM/AM Sweep generator: Center frequency 10.7MHz, 455kHz

• Oscilloscope

• AC VTVM

• FM multiplex signal generator preferably with RF output

a) Connect a 0.01µF capacitor between TP1 and ground before the alignment.

b) Connect a 220kΩ resistor in series with the vertical input terminal of the oscilloscope.

c) Remove the meter lead from terminal 18, then terminate a 4.7kΩ resistor between terminal 18 and ground.

d) Connect the vertical input to terminal 18.

e) Set the selector switch to FM MONO.

f) Connect the output lead of the sweep generator to the FM antenna terminals.

g) Set the output level of the sweep generator to 90dB.

h) Adjust the primary and secondary cores of T6 to obtain a symmetrical pattern.

i) Set the output level of the sweep generator to 70dB.

j) Adjust the cores of T4 and T5 for maximum gain and symmetry of the pattern.

k) Vary the output level of the sweep generator from 60dB to 100dB, then keep the top of the pattern flat and make sure that the center frequency does not drift. If it drifts, repeat steps (g) to (j).

l) Remove the capacitor (4.7µF) from terminal 28.

m) Disconnect the vertical input from terminal 18, then reconnect it to TP1.

n) Set the output level of the sweep generator to 70dB.

o) Observe the S-curve pattern when adjusting the cores of T7. (Linearity is improved by the primary core; symmetry by the secondary core.)

p) Disconnect the 0.01µF capacitor from TP1 after the alignment has been completed.

q) Connect the capacitor (4.7µF) to terminal 28 after the alignment has been completed.

a) Turn the selector switch to AM.

b) Connect the output lead of the sweep generator to the AM antenna terminal.

c) Connect the vertical input of the oscilloscope to the TAPE REC jack.

d) Set the output level of the sweep generator to 75dB.

e) Adjust the IFT cores (T9, T10, T11) as shown in Fig. 1, for maximum gain and symmetrical pattern.

a) Turn the selector switch to FM MONO.

b) Connect the output leads of the FM signal generator to the FM antenna terminals.

c) Set the FM signal generator to modulation 400Hz, 30% and output level 15dB frequency 90MHz; also set the receiver dial at 90MHz.

d) Connect the VTVM and oscilloscope (in parallel) to the TAPE REC jack.

e) Observing the output level on the VTVM, adjust the following cores for maximum reading on the meter:

• T3: Oscillator circuit

• T1: Antenna circuit

• T2: RF circuit

f) Set the frequency of the FM signal generator and the receiver dial to 106MHz.

g) Adjust as follows:

• Trimmer capacitor CT3: Oscillator circuit

• Trimmer capacitor CT1: Antenna circuit

• Trimmer capacitor CT2: RF circuit

h) Repeat steps (e) to (g) several times.

i) Set the output level of the FM signal generator to maximum signal meter deflection.

j) Adjust the primary core of T7 for minimum sound distortion.

a) Turn the selector switch to AM.

b) Connect the AM signal generator to the AM antenna terminal.

c) Set the AM signal generator to modulation 400Hz, 30%, output level 30dB, frequency 600kHz. Set the receiver dial at 600kHz.

d) Connect the VTVM and oscilloscope (in parallel) to the TAPE REC jack.

e) Observing the output level on the VTVM, adjust the following cores for maximum reading:

• T8: Oscillator circuit

• Ferrite loopstic antenna: Antenna circuit

f) Set the AM signal generator and the receiver dial to 1,400kHz.

g) Observing the output level on the VTVM, adjust the following cores for maximum reading:

• CT5: Oscillator circuit

• CT4: Antenna circuit

h) Repeat alignments (e) to (g) several times.

i) After these alignments, lock the trimmer capacitor with paint.

a) Modulate the FM signal generator output by FM MPX modulator.

b) Turn the selector switch to FM AUTO.

c) Connect the FM signal generator to the FM antenna terminals.

d) Set the FM MPX modulator to modulation; main 1kHz (L+R) 60%, pilot 8 ~ 10%.

e) Set the output level of the FM signal generator to 60dB.

f) Turn the tuning knob to maximum reading on the signal meter.

g) Set the modulation of the FM MPX modulator to pilot only.

h) Connect the oscilloscope to TP2.

i) Adjust the transformers (T13, T14, T15) until the output level of the 19kHz becomes maximum on the scope.

j) Set the FM MPX modulator to pilot with L or R signal.

k) Connect the dual-trace oscilloscope and VTVM to the TAPE REC jacks.

l) Adjust the semi-fixed potentiometer on the tuner unit until the output level of the L or R signal becomes maximum on the scope.

a) Connect the FM signal generator to the FM antenna terminals.

b) Modulate the FM signal generator connected to the audio generator, check that the frequency response shows troughs at around 67kHz and 72kHz.

a) Connect the FM signal generator to the FM antenna terminals.

b) Turn the selector switch to FM AUTO.

c) Modulate the FM signal generator connected to the FM MPX modulator, and set the FM MPX modulator pilot on. Check that the stereo indicator lamp goes in. Then set the FM MPX modulator to pilot off, and check that the stereo indicator lamp goes out.

The packing components include:

• SIDE PAD (AHA-019-0)

• OPERATING INSTRUCTIONS (ARB-054-0)

• PACKING CASE (AHD-088-0)

The unit itself is the SX-424.

NOTE

1. SWITCH IS SHOWN AT THE FIRST POSITION.

2. DC CURRENT AT NO INPUT SIGNAL.

V DC VOLTAGE AT NO INPUT SIGNAL.

DC VOLTAGE AT MAX INPUT SIGNAL.

SIGNAL VOLTAGE WHEN 13W/8Ω IS ACQUIRED.

3. Cq, Cg IS NOT PROVIDED IN FTZ MODEL.